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.Management Sciences
Category: Process Control and Instrumentation
The frequency response of a first order system, has a phase shift with lower and upper bounds given by________________?
A. – ∞, π/2
B. -π/2, π/2
C. -π/2, 0
D. 0, π/2
Flow rate of a river is measured by a/an____________________?
A. Pitot tube
B. Vane meter
C. Kennison nozzle
D. Open weir
The transfer function for a PID controller is (where, η i is the integral (reset) time and ηD is the derivative time.) ?
A. Kc(1 + ηis + ηD ). s
B. Kc[1 + (1/ηis) + ηD . s)
C. Kc(1 + ηis + (1/ηD . s)
D. None of these
The closed loop pole of a stable second order system could be_______________?
A. Both real and positive
B. Complex conjugate with positive real parts
C. Both real and negative
D. One real positive and the other real negative
Liquid discharge from a tank or reservoir cannot be measured by __________________?
A. Orificemeter
B. Weirs
C. Mouthpieces
D. Notches
Which of the following can measure temperatures in the range of – 20 to 300°C ?
A. Mercury in glass thermometer
B. Vapor pressure thermometer
C. Resistance thermometer
D. None of these
Time constant is the __________________?
A. Time taken by the controlled variable to reach 63.2% of its full change
B. Same as transportation lag
C. Same as dead time
D. Time required by the measured variable to reach 63.2% of its ultimate change
Gas analysis is commonly done using the___________________?
A. Thermal conductivity cell
B. X-ray diffraction
C. Mass spectrometer
D. Emission spectrometer
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